Key-fastener.



v PATBNTED MAR. 26, 1901. A. A. SKZBNSKBN.

KEY FASTBNER.

APPLICATION FILED APR. 4,1906.

' Ham s-21mm THE nonms PETERS 5a., WASHINGTON n n.

ANDES AUGUST SVENSEN, OF EVANS TON, ILLINOIS.

KEY-FASTENER- Specification of Letters Patent.

Patented March 26, 1907.

Application filed April 4,1906. Serial No. 309,798.

To all whom it may concern:

Be it known that I, ANDEs AUGUST SVEN- SEN, a citizen of the United States, residing at Evanston, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Key-Fasteners, (Case 1,) of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to looks, and more particularly to the ordinary door-locks or the like, and contemplates improved locking mechanism for association with the lock to look a key in such manner within the lock that manipulation or displacement thereof from the opposite side of the doors will be prevented.

My invention will be best understood by reference to the accompanying drawings, in

. which Figure 1. is a front view showing a lock escutcheon-plate with my improved device applied thereto to lock the key. Fig. 2 is a rear view of the escutcheon-plate shown in Fig. .1 with the locking mechanism attached. Fig. 3 is a sectional view taken on line 3 3 of Fig. 1. Fig. 4 is a detached front view of my improved locking mechanism, showing the key in unlocked position. Fig. 5 is a similar view showing the key in locked position. Fig. 6 is a side elevation of auxiliary locking mechanism. Fig. 7 shows a modi fied arrangement of the locking mechanism with respect to the escutcheon-plate. Fig. 8 is a sectional view taken on line 8 8 of Fig. 7. Fig. 9 is a view similar to Fig. 7, the auxiliary locking mechanism being in modified construction. Fig. 10 is an enlarged end view of the auxiliary mechanism, taken on line 10 10 of Fig. 9. Fig. 11 is a detached view showing auxiliary locking mechanism in section, and Fig. 12 is a detached view showing guiding means for a movable member of the locking mechanism.

The device of my invention consists, primarily, of a supporting-plate 1, which is secured rigidly with respect to the lock of the door and has a keyhole 2, which will register with the lock-keyhole when the plate is in position. As shown in Figs. 7, 8, and 9, this supporting-plate has extensions or fiat lugs 3 and 4, whereby it may be secureddirectly to the door-frame below the escutcheon-plate 5 by means of wood-screws 6, the escutcheonplate being for this purpose slightly raised I from the door by means of a filling-plate 7.

, supporting-plate may be secured directly to the escutcheon-plate by means of rivets 8, passing through the extensions 3 and 4 and the escutcheon-plate, and thus my device may be applied directly to new looks to form a part thereof.

The horizontal edges of the supportingplate are formed over a die a distance to form guideways 9 and 10, between which. is mounted a plate 11, which is retained on the supporting-plate by the heads of the screws 12 and which may reciprocate on the supporting-frame the length of the slots 13, through which the screw is engaged. This reciprocating plate has also a keyhole 14.; but a spring 15, supported from the supporting-plate and bearing against the rear edge of the reciprocating plate, tends to hold the reciprocating plate to the left in the drawings shown, in which position the keyholes will be out of register. An extension 16 from the left end of the movable plate terminates in the thumb-plate 17, by means of which the plate may be moved to the right against the action of the spring 15 to carry the keyholes into register to allow insertion of a key.

One of the objects of my invention is to cause the key to be locked against subsequent rotation after it has been turned to lock the door. Where the shank of the key is flat, this is accomplished in one way by the longitudinal slot 18 cut in the movable plate to the right of the keyhole 14. The plate 11 is held to the right until the key has been turned to lock the door, whereupon the shank is brought to a horizontal position and the plate released, the spring 15 then throwing the plate forwardly to engage the slot 18 about the key-shank, and subsequent rotation of the key will be prevented. Where the key-shank is round, other means must be provided for looking it, one way being to provide sharp teeth or serrations 19 along the right edge of the circular opening of the movable keyhole, as shown, and after the key has been suitably actuated these teeth will be carried into gripping engagement with the key-shank and will lock it against undesired rotation. Instead of having teeth on the right edge of the movable keyhole, teeth 20 may be provided along the left edge of the keyhole in the supporting-plate in such position that the plate 11 upon release will be moved to carry the key-shank against the points of the teeth to prevent subsequent rotation of the key. Both sets of teeth, however, may be used whereby the gripping action will be increased. Another modification would be the use of a slot in conjunction with either one or both sets of teeth, and the iary locking mechanism comprises a baseplate 21, having a pivot extension 22, to which is pivoted at one end the latch-lever 23, having a tooth 24 extending from its lower edge for engagement in the opening 25 through the base-plate 21. The front end of the lever when the tooth engages in the slot 25 will engage and be locked between the extensions 26 and 27 at the lower end of the base-plate. The extension 16 from the movable plate 11 has a slot 28, and the base-plate 21 of the auxiliary locking means is secured in such position to the left of the escutcheonplate that the slots 25 and 28 will register when the plate 1 1 has been pulled outwardly, and-thus after the spring has acted to throw the plate to lock the key the plate may be rigidly locked in this position by the tooth 24, carried by the lever 23 to engage both the slots 25 and 28, This auxiliary mechanism may be secured to the door-frame by means of wood-screws 2-9, or, as shown in Fig. 7, may be integral with the supporting-plate 1, and this arrangement will be preferable where my device is to be used in connection with new looks, thus making the lock of my improved locking mechanism a unitary device. Of course where this auxiliary mechanism forms part of the supporting-plate it will be unnecessary to further secure the locking means, as by means of the wood-screws.

In Figs. 9, 10, 11, and 12 I show modified auxiliary locking means. Here I provide a base-plate 30, which may be integral with the supporting-plate or separate therefrom and secured by Wood-screws 31, as shown, this base-plate having a bridge part or strap 32, between which and the plate the extension 16 of the movable plate passes, being also 'uided therein by the pin 33 engaging in the sIot 34 in said extension. In the center of this bridge or strap member a lever 35 is pivoted by means of the pivot-screw or pin 36, a handle 37 extending from the front end of the lever. This lever is of such length that a tooth 38, extending from the front edge thereof, will engage in a slot or channel 39 cut in the inner face of the thun'ib-plate 17. hen the spring has moved the plate 11 to lock the key, this lever is then retated to carry the tooth into the slot, thus to rigidly lock the plate independently of the spring. The spring may be insullicient to cause enough pressure to sulliciently bite or grip the teeth into the key, and in the locking arrangement shown in Figs. 1. to 6 the slots 28 and 25 may be relatively so disposed that additional pull must be exerted on the plate 1 1 to carry them into register, this pull serving to draw the teeth-points into good biting and gripping engagement with the key, and when the lever 23 is then locked this secure engagement will be maintained. In the same way in the modification shown in Figs. 9, 10, 11, and 12 the adjustment may be such that the plate 1]. must be pulled out a distance before the lever can be locked. This additional pull, however, in this modification may be inherent in the plate 17 and in the lever, the slot and lever ends being so adjusted that when the lever is forced into locking engagement additional pull will be exerted on the plate and the trame-gri ping relation of the teeth against the key maintained.

I do not wish to be limited to the precise arrangements and mechanical constructions.

herein shown and described, as changes may readily be made without departing from the scope of the following claims, which I desire to secure by Letters Patent.

I claim- 1. In a locking device for association with door-locks or the like, the combination with a plate adapted to be secured rigidly with respect to the lock, said. plate having a key hole in register with the lock-keyhole, a movable plate lying acent to the immovable plate and also having a keyhole, spring mechanism tending to move the movable plate at one side to hold the keyhole thereof out of register with the other keyholes to prevent insertion of a key in the lock, said keyhole when the plate is removed in. the other direction. coming in register to allow insertion of a key, a slot at one side of said keyhole for engaging the shank of the inserted key when said shank is flat upon return of the movable plate by the spring mechanism, gripping-teeth about the front edge of said slot and about the face of the keyhole in the immovable plate for engaging the shank of the inserted key when said shank is round upon return movement of the plate by the spring mechanism whereby an inserted key is locked against. subsequent rotation or escape from the lock, and auxiliary locking means for engaging an extension on said movable plate and thereby locking said movable plate after actuation by the spring mechanism to hold the slot or teeth in lirm engagement with the inserted key.

2. In a locking device for association with a door-lock or the like, the combination with a plate adapted to be secured with respect to the lock and having a keyhole in register with the lock-keyhole, of a movable plate mounted on the immovable plate and also having a keyhole, spring means tending to hold the movable plate and keyhole therein to one side to prevent insertion of a key in the lock, movement of the movable plate against the spring action causing the keyholes to come into register to allow insertion of a key, teeth at one side of the movable keyhole brought into engagement with the shank of the inserted key as the movable plate is returned toward its normal position by the spring, and pivoted locking-lever provided with a handle. and adapted to be swung into engagement with a slot in an extension of the movable plate after actuation thereof by the spring means to hold the teeth in firm gripping engagement with the key.

3. In a locking device for association with a door-lock or the like. the combination with a supporting-plate adapted to be secured with respect to the lock and having a keyhole in register with the lock-keyhole, a second plate mounted on said supporting-plate to be reciprocated thereon and also having a keyhole, a spring tending to hold said movable plate to one side and the keyholes out of register,movement of the plate in the other direction causing the keyholes to come into register to allow insertion of a key in the lock, locking-teeth along one side of the keyhole of the movable plate, locking-teeth'along the opposite side of the keyhole of the supporting-pl ate, said teeth eotiperating to form aclamping-j aw for engaging and gripping the shank of an inserted key upon return of the movable plate to its normal position by the spring whereby said key is prevented from subsequent turning or escape of the lock, and an auxiliary locking-lever pivoted adjacent to the supporting and movable plates and provided with a tooth for engaging a slot in the movable plate to rigidly lock the teeth in firm gripping engagement with the key.

In Witness whereof I hereunto subscribe my name this 26th day of March, A. D. 1906.

ANDES AUGUST SVENSEN. Witnesses CHARLES J. SCHMIDT, LEONARD W. NOVANDER. 

